@Lokman
I'm sorry to hear about your issue, but the update wouldn't delete your data, with that said, did you used Xperia Companion or through the phone ? if you used XC then it should give you 2 options, clean update or just to install the update, it won't update by itself.
As for recovering the pictures, there's no way to do so unless you already have root access, and even then it might not work.
